#include <stdio.h>

void func(int a, int) // 在这儿是占位参数
{
    printf("a = %d\n", a);
}

void func1(int a, int, int, int c)
{
    printf("a = %d\n", a);
    printf("c = %d\n", c);
}

int main(int argc, char const *argv[])
{
    int a = 100;
    func(a, 10);

    func1(a, 10, 100, 100);
    return 0;
}
